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Old 19-04-2009, 08:23   #1
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Battery Question

I currently have 8 6v Interstate U2500HC batteries rated at 275 ah. They are set up as a 24v house system. What is my house bank capacity at 24v, 550?

I am limited on space, but would like suggestions on better/bigger replacements, i.e. Trojan, Rolls, etc.
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Old 19-04-2009, 08:52   #2
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If you take the bank of 8 it is like 2 banks of 4 @ 24 volts so you then multiply the amp hours of one member of the bank of them by 2. You can combine the volts or the amp hours. So yes 550 amp hours would be the bank total rating at 24 volts.

Before you consider bigger replacements consider how you will recharge the bank. your bank size is limited by your daily charging capacity. You can charge it any way you like but you have to do it sometime regularly. A bank this size requires a fair amount of charging. Have you tried to compute how much power you really need.

If you size the bank too large you won't be recharging it fully and so it will not last as long. Over time you only can use a bank as large as you can charge. If it is too small you'll be deeply discharging it and shortening it's lifespan as well. In both cases you'll be wasting a lot of money. You really want the bank sized right. Replacement of the bank with Trojans is over $1,000 right now. All the cables crimped with heat shrink tubing and other assortment of posts and breakers to set up the bank properly also costs a lot.

Better is getting the size just right.
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
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